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A phenomenological theory of the electro-optical properties of isotropic melts in the vicinity of the isotropic to anti-ferroelectric B2 phase transition in banana shaped molecules is developed. The temperature and frequency dependence of the nonlinear dielectric effect in the isotropic phase above the isotropic to anti-ferroelectric B2 phase transition is calculated. We find the analytical expressions...
Using the Landau-de Gennes theory, the temperature, pressure and frequency dependence of the non-linear effect in the isotropic phase above the isotropic–cholesteric phase transition is calculated. The influence of pressure on the isotropic–cholesteric phase transition is discussed by varying the coupling between the orientational order parameter and the macroscopic polarization of polar cholesterics...
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